Tell that to a dictionary. Seriously, you can't ignore the meaning of words (well you can if you want to be wrong). You can interpret things that are meant to be ambiguous and open to interpretation, but not unambiguous statements like Munjis.
Here's the quote below:
THe only statement being made is that people who have tattoos have somethign in common with "[all] prisoners, bikers, gangbangers" etc. Now, its possible that not all of those people have tattoos, but if they did, it is a matter of fact that you have something in common with them. You all have tattoos. You may not like it (as Munji says), but it is a fact - two people with tattoos have something in common. I have something in common with the leader of Burma, that is also a fact. But, I'm not flying off the handle if someone wants to point that fact out.
What Munji is not saying in that quote is that all people who have tattoos are "prisoners, bikers, gangbangers", which seems to be the fatal interpretive error that you have made. If you read what he has actually written, you will see that is correct. You are reading an analogy into what's written that Munji never made. OTOH, by failing to read carefully, I bet you fell right into his bait.